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>Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting</TH
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>Appendix T. ASCII Table</H1
><P
>Traditionally, a book of this sort has an <A
HREF="special-chars.html#ASCIIDEF"
>ASCII</A
> Table appendix.
      This book does not. Instead, here are several short
      scripts, each of which generates a complete ASCII table.</P
><DIV
CLASS="EXAMPLE"
><HR><A
NAME="ASCIISH"
></A
><P
><B
>Example T-1. A script that generates an ASCII table</B
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CLASS="PROGRAMLISTING"
>   1&nbsp;#!/bin/bash
   2&nbsp;# ascii.sh
   3&nbsp;# ver. 0.2, reldate 26 Aug 2008
   4&nbsp;# Patched by ABS Guide author.
   5&nbsp;
   6&nbsp;# Original script by Sebastian Arming.
   7&nbsp;# Used with permission (thanks!).
   8&nbsp;
   9&nbsp;exec &#62;ASCII.txt         #  Save stdout to file,
  10&nbsp;                        #+ as in the example scripts
  11&nbsp;                        #+ reassign-stdout.sh and upperconv.sh.
  12&nbsp;
  13&nbsp;MAXNUM=256
  14&nbsp;COLUMNS=5
  15&nbsp;OCT=8
  16&nbsp;OCTSQU=64
  17&nbsp;LITTLESPACE=-3
  18&nbsp;BIGSPACE=-5
  19&nbsp;
  20&nbsp;i=1 # Decimal counter
  21&nbsp;o=1 # Octal counter
  22&nbsp;
  23&nbsp;while [ "$i" -lt "$MAXNUM" ]; do  # We don't have to count past 400 octal.
  24&nbsp;        paddi="    $i"
  25&nbsp;        echo -n "${paddi: $BIGSPACE}  "       # Column spacing.
  26&nbsp;        paddo="00$o"
  27&nbsp;#       echo -ne "\\${paddo: $LITTLESPACE}"   # Original.
  28&nbsp;        echo -ne "\\0${paddo: $LITTLESPACE}"  # Fixup.
  29&nbsp;#                   ^
  30&nbsp;        echo -n "     "
  31&nbsp;        if (( i % $COLUMNS == 0)); then       # New line.
  32&nbsp;           echo
  33&nbsp;        fi
  34&nbsp;        ((i++, o++))
  35&nbsp;        # The octal notation for 8 is 10, and 64 decimal is 100 octal.
  36&nbsp;        (( i % $OCT == 0))    &#38;&#38; ((o+=2))
  37&nbsp;        (( i % $OCTSQU == 0)) &#38;&#38; ((o+=20))
  38&nbsp;done
  39&nbsp;
  40&nbsp;exit $?
  41&nbsp;
  42&nbsp;# Compare this script with the "pr-asc.sh" example.
  43&nbsp;# This one handles "unprintable" characters.
  44&nbsp;
  45&nbsp;# Exercise:
  46&nbsp;# Rewrite this script to use decimal numbers, rather than octal.</PRE
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><DIV
CLASS="EXAMPLE"
><HR><A
NAME="ASCII2SH"
></A
><P
><B
>Example T-2. Another ASCII table script</B
></P
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><PRE
CLASS="PROGRAMLISTING"
>   1&nbsp;#!/bin/bash
   2&nbsp;# Script author: Joseph Steinhauser
   3&nbsp;# Lightly edited by ABS Guide author, but not commented.
   4&nbsp;# Used in ABS Guide with permission.
   5&nbsp;
   6&nbsp;#-------------------------------------------------------------------------
   7&nbsp;#-- File:  ascii.sh    Print ASCII chart, base 10/8/16         (JETS-2012)
   8&nbsp;#-------------------------------------------------------------------------
   9&nbsp;#-- Usage: ascii [oct|dec|hex|help|8|10|16]
  10&nbsp;#--
  11&nbsp;#-- This script prints out a summary of ASCII char codes from Zero to 127.
  12&nbsp;#-- Numeric values may be printed in Base10, Octal, or Hex.
  13&nbsp;#--
  14&nbsp;#-- Format Based on: /usr/share/lib/pub/ascii with base-10 as default.
  15&nbsp;#-- For more detail, man ascii . . .
  16&nbsp;#-------------------------------------------------------------------------
  17&nbsp;
  18&nbsp;[ -n "$BASH_VERSION" ] &#38;&#38; shopt -s extglob
  19&nbsp;
  20&nbsp;case "$1" in
  21&nbsp;   oct|[Oo]?([Cc][Tt])|8)       Obase=Octal;  Numy=3o;;
  22&nbsp;   hex|[Hh]?([Ee][Xx])|16|[Xx]) Obase=Hex;    Numy=2X;;
  23&nbsp;   help|?(-)[h?])        sed -n '2,/^[ ]*$/p' $0;exit;;
  24&nbsp;   code|[Cc][Oo][Dd][Ee])sed -n '/case/,$p'   $0;exit;;
  25&nbsp;   *) Obase=Decimal
  26&nbsp;esac # CODE is actually shorter than the chart!
  27&nbsp;
  28&nbsp;printf "\t\t## $Obase ASCII Chart ##\n\n"; FM1="|%0${Numy:-3d}"; LD=-1
  29&nbsp;
  30&nbsp;AB="nul soh stx etx eot enq ack bel bs tab nl vt np cr so si dle"
  31&nbsp;AD="dc1 dc2 dc3 dc4 nak syn etb can em sub esc fs gs rs us sp"
  32&nbsp;
  33&nbsp;for TOK in $AB $AD; do ABR[$((LD+=1))]=$TOK; done;
  34&nbsp;ABR[127]=del
  35&nbsp;
  36&nbsp;IDX=0
  37&nbsp;while [ $IDX -le 127 ] &#38;&#38; CHR="${ABR[$IDX]}"
  38&nbsp;   do ((${#CHR}))&#38;&#38; FM2='%-3s'|| FM2=`printf '\\\\%o  ' $IDX`
  39&nbsp;      printf "$FM1 $FM2" "$IDX" $CHR; (( (IDX+=1)%8))||echo '|'
  40&nbsp;   done
  41&nbsp;
  42&nbsp;exit $?</PRE
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><DIV
CLASS="EXAMPLE"
><HR><A
NAME="ASCII3SH"
></A
><P
><B
>Example T-3. A third ASCII table script, using
                   <I
CLASS="FIRSTTERM"
>awk</I
></B
></P
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><PRE
CLASS="PROGRAMLISTING"
>   1&nbsp;#!/bin/bash
   2&nbsp;# ASCII table script, using awk.
   3&nbsp;# Author: Joseph Steinhauser
   4&nbsp;# Used in ABS Guide with permission.
   5&nbsp;
   6&nbsp;
   7&nbsp;#-------------------------------------------------------------------------
   8&nbsp;#-- File:  ascii     Print ASCII chart, base 10/8/16         (JETS-2010)
   9&nbsp;#-------------------------------------------------------------------------
  10&nbsp;#-- Usage: ascii [oct|dec|hex|help|8|10|16]
  11&nbsp;#--
  12&nbsp;#-- This script prints a summary of ASCII char codes from Zero to 127.
  13&nbsp;#-- Numeric values may be printed in Base10, Octal, or Hex (Base16).
  14&nbsp;#--
  15&nbsp;#-- Format Based on: /usr/share/lib/pub/ascii with base-10 as default.
  16&nbsp;#-- For more detail, man ascii
  17&nbsp;#-------------------------------------------------------------------------
  18&nbsp;
  19&nbsp;[ -n "$BASH_VERSION" ] &#38;&#38; shopt -s extglob
  20&nbsp;
  21&nbsp;case "$1" in
  22&nbsp;   oct|[Oo]?([Cc][Tt])|8)       Obase=Octal;  Numy=3o;;
  23&nbsp;   hex|[Hh]?([Ee][Xx])|16|[Xx]) Obase=Hex;    Numy=2X;;
  24&nbsp;   help|?(-)[h?])        sed -n '2,/^[ ]*$/p' $0;exit;;
  25&nbsp;   code|[Cc][Oo][Dd][Ee])sed -n '/case/,$p'   $0;exit;;
  26&nbsp;   *) Obase=Decimal
  27&nbsp;esac
  28&nbsp;export Obase   # CODE is actually shorter than the chart!
  29&nbsp;
  30&nbsp;awk 'BEGIN{print "\n\t\t## "ENVIRON["Obase"]" ASCII Chart ##\n"
  31&nbsp;           ab="soh,stx,etx,eot,enq,ack,bel,bs,tab,nl,vt,np,cr,so,si,dle,"
  32&nbsp;           ad="dc1,dc2,dc3,dc4,nak,syn,etb,can,em,sub,esc,fs,gs,rs,us,sp"
  33&nbsp;           split(ab ad,abr,",");abr[0]="nul";abr[127]="del";
  34&nbsp;           fm1="|%0'"${Numy:- 4d}"' %-3s"
  35&nbsp;           for(idx=0;idx&#60;128;idx++){fmt=fm1 (++colz%8?"":"|\n")
  36&nbsp;           printf(fmt,idx,(idx in abr)?abr[idx]:sprintf("%c",idx))} }'
  37&nbsp;
  38&nbsp;exit $?</PRE
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